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Allegro MicroSystems UDN2916B-T
- Part No.:
- UDN2916B-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 24-PowerDIP (0.300", 7.62mm)
- Datasheet:
-
UDN2916B-T.pdf
- Description:
- IC MTRDRV BIPLR 4.75-5.25V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,043
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Product details
Overview
UDN2916B-T from Allegro MicroSystems is a discontinued dual full-bridge PWM motor driver IC designed to control both windings of bipolar stepper motors or bidirectionally drive two DC motors. It delivers 750 mA continuous output current per bridge, sustains 45 V motor supply voltage, and features internal PWM current control with selectable 0%/33%/67%/100% current limits - used in industrial motion control, printer mechanisms, and automated valve actuation.
For engineers reviewing the UDN2916B-T datasheet, UDN2916B-T pinout, UDN2916B-T application, or UDN2916B-T equivalent, key selection considerations include its batwing DIP-24 package thermal performance, integrated clamp/flyback diodes, fixed off-time PWM architecture (46 μs typ.), and logic-level I0/I1 current scaling inputs for microprocessor-controlled stepping sequences.
Technical Context
The UDN2916B-T implements two independent H-bridge outputs with internal source/sink drivers, each supporting up to 750 mA continuous current and 45 V sustaining voltage. Current regulation uses external RC timing (RT/CT) to set fixed off-time (~46 μs), while peak current is determined by VREF and sense resistor RS via ITRIP = VREF/10RS.
Logic control includes PHASE inputs for direction, plus I0/I1 digital inputs selecting four discrete current levels; thermal shutdown activates at TJ = 170°C and recovers at 145°C. Internal ground-clamp and flyback diodes eliminate need for external protection components in standard inductive load switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 750 mA continuous per bridge - enables direct driving of medium-torque stepper windings without external current amplification. |
| Motor Supply Voltage | 45 V max - supports 24 V and 36 V industrial motor rails with margin for inductive kickback. |
| Output Saturation Voltage | <1.8 V total (source + sink) at 500 mA - reduces power loss and thermal stress during sustained conduction. |
| PWM Fixed Off-Time | 46 μs typical (RT = 56 kΩ, CT = 820 pF) - sets minimum current decay interval to maintain regulation above audible range. |
| Thermal Shutdown Threshold | 170°C junction temperature - protects against latch-up or metallization failure under overload or poor heatsinking. |
| Logic Supply Range | 4.75–5.25 V - compatible with standard 5 V TTL/CMOS microcontroller interfaces without level shifting. |
| Current Limit Selection | Digital I0/I1 inputs select 0%, 33%, 67%, or 100% of max current - enables torque-matched half-step sequencing and hold/start current modulation. |
Pinout & Package
The UDN2916B-T is supplied in a 24-pin dual in-line plastic (DIP) package with batwing leads (Package B) - pins 6, 7, 18, and 19 are internally fused heat-sinkable tabs providing enhanced thermal dissipation (θJA = 40°C/W on standard board).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 23, 24 | Ground | Dedicated low-impedance return paths for logic, sense, and power grounds - critical for accurate current sensing and noise immunity. |
| 3, 4, 21, 22 | OUT1A / OUT1B / OUT2A / OUT2B | H-bridge output terminals - connect directly to motor winding ends; each pair forms one full bridge. |
| 5, 20 | E1 / E2 | Emitter outputs - tied to motor winding center taps or used as current sense return points in unipolar configurations. |
| 6, 7, 18, 19 | Batwing Leads | Internally fused thermal tabs - soldered to large copper areas to reduce θJA and sustain 750 mA per bridge continuously. |
| 8, 9 | SENSE1 / SENSE2 | Current sense inputs - accept voltage drop across external RS resistors to trigger PWM current limiting. |
| 10, 11 | PHASE1 / PHASE2 | Direction control inputs - determine current flow polarity through respective bridges; include 2 μs internal dead time. |
| 12, 13 | I0 / I1 | Digital current scale select - configure four discrete output current levels (0% to 100%) for microstepping or torque management. |
| 14, 15 | VREF1 / VREF2 | Reference voltage inputs - set trip threshold for PWM current limit (ITRIP = VREF/10RS); support independent tuning per bridge. |
| 16 | VCC | Logic supply input - powers internal logic, comparators, and monostables; requires stable 5 V ±5%. |
| 17 | VBB | Motor supply input - high-current path for bridge sourcing; must be decoupled with ≥47 μF electrolytic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Clamp Diodes | Eliminates need for external flyback diodes - simplifies PCB layout and reduces BOM count for inductive load switching. |
| Internal Thermal Shutdown | Auto-recovery at 145°C after 170°C trip - prevents permanent damage during transient overloads or inadequate heatsinking. |
| Dual Independent PWM Bridges | Enables simultaneous, asynchronous control of two stepper phases or separate DC motors - no shared timing constraints. |
| Low Output Saturation Voltage | <1.2 V per transistor at 750 mA - minimizes conduction losses and allows operation at higher ambient temperatures. |
| Logic-Level Compatible Inputs | I0/I1 and PHASE accept standard 5 V TTL thresholds - interfaces directly with microcontrollers without buffer circuitry. |
Applications
| Industrial Printer Head Positioning | Bipolar Stepper Motor Control |
|---|---|
|
Use Scenario: Precise bidirectional movement of print head carriages using 1.8° bipolar stepper motors. IC Role / Device Role / Timing Role: Dual full-bridge driver executing microprocessor-generated step/direction sequences with real-time current scaling. Use Value: Enables torque-consistent half-stepping via I0/I1 current selection (100% single-phase, 67% dual-phase), reducing vibration and positional error. |
Use Scenario: Open-loop position control in CNC tool changers and linear actuators requiring 750 mA per phase. IC Role / Device Role / Timing Role: H-bridge interface between MCU GPIO and stepper windings, managing PHASE polarity and PWM current decay timing. Use Value: Fixed 46 μs off-time ensures current regulation remains above audible frequencies while maintaining torque at 200–500 pps step rates. |
| Automated HVAC Damper Actuation | Lab Equipment Sample Stage Translation |
|
Use Scenario: Low-speed, high-hold-torque positioning of HVAC air dampers in commercial building systems. IC Role / Device Role / Timing Role: Bidirectional DC motor driver with programmable current reduction during hold state to minimize self-heating. Use Value: I0/I1 logic inputs allow MCU to switch between full-torque (startup) and 33% current (hold), cutting standby power by >70%. |
Use Scenario: Sub-micron precision translation stages in optical microscopy and spectrometry platforms. IC Role / Device Role / Timing Role: Bipolar stepper driver implementing microstepping via analog VREF adjustment and digital current scaling. Use Value: Independent VREF1/VREF2 inputs permit asymmetric current tuning per phase - critical for minimizing resonance in high-inertia loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual full-bridge motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A4970 | Successor device with improved thermal performance (θJA = 30°C/W), wider VBB range (up to 50 V), and integrated current sense amplifier. | Supports higher motor voltages and eliminates external RS resistor; requires updated PCB layout due to SOIC-24 footprint. | Select A4970 for new designs requiring extended voltage headroom, lower thermal resistance, or simplified current sensing. |
| UC3770 | Legacy dual H-bridge with 1.2 A peak current, no internal PWM - requires external oscillator and comparator for current control. | Demands more external components and design effort; lacks integrated thermal shutdown and logic-level compatibility. | Consider UC3770 only for legacy system replacements where UDN2916B-T footprint and pinout must be retained. |
Compared with UDN2916B-T, the A4970 offers higher integration and thermal capability but requires layout revision, while the UC3770 provides mechanical compatibility at the cost of increased component count and reduced protection features.
Availability
UDN2916B-T is available at Aetrix Electronics and suitable for industrial automation, laboratory instrumentation, and legacy printer repair requiring stable component supply despite end-of-life status.
Supply support for UDN2916B-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Allegro MicroSystems is a U.S.-based designer and manufacturer of high-performance magnetic sensors and power ICs, founded in 1989 and headquartered in Worcester, Massachusetts.
The UDN2916B-T belongs to Allegro's legacy motor driver product line, engineered specifically for cost-sensitive, thermally constrained bipolar stepper and dual-DC motor control in industrial and office equipment.
FAQ
Is UDN2916B-T still in production?
No, the UDN2916B-T is a discontinued product. Allegro officially ended production and no longer offers samples. It should not be selected for new designs. However, Aetrix Electronics maintains limited legacy stock for repair and maintenance of existing equipment where redesign is impractical.
What is the maximum continuous current per bridge for UDN2916B-T?
The UDN2916B-T supports 750 mA continuous output current per bridge under proper thermal conditions - verified at TA = 25°C with adequate heatsinking via batwing leads. Peak current capability is 1.0 A, but duration must be limited to avoid exceeding TJ(max) = 150°C.
Can UDN2916B-T drive a unipolar stepper motor?
Yes, the UDN2916B-T can drive unipolar stepper motors by configuring each bridge as a high-side switch with external flyback diodes, though its native design targets bipolar operation. Use of the E1/E2 emitter pins and careful current sensing is required to avoid exceeding the 1.5 V SENSE terminal rating.
What package type does UDN2916B-T use?
The UDN2916B-T uses the Package B - a 24-pin plastic dual in-line package (DIP) with batwing leads (pins 6, 7, 18, 19). These fused leads serve as thermal tabs, enabling enhanced power dissipation (θJA = 40°C/W) when soldered to copper planes.
How does current limiting work in UDN2916B-T?
UDN2916B-T uses internal PWM current limiting: an external sense resistor (RS) converts load current to voltage, compared against VREF/10. When threshold is reached, a monostable turns off the source driver for a fixed off-time (set by RT/CT), then repeats - maintaining average current at the programmed level.
UDN2916B-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-PowerDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Motor Type - Stepper:
- Bipolar
- Motor Type - AC, DC:
- Brushed DC
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (4)
- Interface:
- Parallel
- Technology:
- Bipolar
- Step Resolution:
- -
- Applications:
- General Purpose
- Current - Output:
- 750mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Voltage - Load:
- 10V ~ 45V
- Operating Temperature:
- -20°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-DIP
UDN2916B-T FAQ
1.How can I place an order for UDN2916B-T through Aetrix?
Please submit a Request for Quotation (RFQ) for UDN2916B-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for UDN2916B-T reliable?
The price and inventory of UDN2916B-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UDN2916B-T is usually 5 days.
3.What payment methods are accepted for UDN2916B-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UDN2916B-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UDN2916B-T?
UDN2916B-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UDN2916B-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for UDN2916B-T?
For technical support, including UDN2916B-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UDN2916B-T requirements.
6.How does Aetrix verify that UDN2916B-T is sourced from the original manufacturer or authorized distributors?
All UDN2916B-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UDN2916B-T meets industry standards.
7.What is the process for return or replacement of UDN2916B-T?
All UDN2916B-T units undergo pre-shipment inspection (PSI). If there is an issue with UDN2916B-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The UDN2916B-T part is unused and in its original packaging.
Return procedure for UDN2916B-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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